<?php
/**
 * Created by PhpStorm.
 * User: 小灰灰
 * Date: 2020-03-10
 * Time: 11:48:36
 * Info: 退款查询
 */

/**使用方法：
 *
 * //以下四个单号四选一。查询的优先级是： 微信退款单号 > 商户退款订单号 > 微信订单号 > 商户订单号
 * $orderNo = '';                      //商户订单号
 * $wxOrderNo = '';                     //微信订单号
 * $refundNo='';                       //商户退款订单号
 * $refundId = '';                     //微信退款单号（微信生成的退款单号，在申请退款接口有返回）
 *
 * $wxPay = new RefundQuery($mchid,$appid,$apiKey);
 * $result = $wxPay->doRefundQuery($refundNo, $wxOrderNo,$orderNo,$refundId);
 * if($result===true){
 * echo 'refund success';exit();
 * }
 * echo 'refund fail';
 */

namespace wxpay;

class RefundQuery
{

    protected $mchid;

    protected $appid;

    protected $apiKey;

    public $data = null;

    public function __construct($mchid, $appid, $key)
    {
        $this->mchid  = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号
        $this->appid  = $appid; //微信支付申请对应的公众号的APPID
        $this->apiKey = $key;   //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
    }

    /**
     * 退款查询
     *
     * @param string $refundNo  商户退款单号
     * @param string $wxOrderNo 微信订单号
     * @param string $orderNo   商户订单号
     * @param string $refundId  微信退款单号
     *
     * @return string
     */
    public function doRefundQuery($refundNo = '', $wxOrderNo = '', $orderNo = '', $refundId = '')
    {
        $config          = array(
            'mch_id' => $this->mchid,
            'appid'  => $this->appid,
            'key'    => $this->apiKey,
        );
        $unified         = array(
            'appid'          => $config['appid'],
            'mch_id'         => $config['mch_id'],
            'nonce_str'      => self::createNonceStr(),
            'sign_type'      => 'MD5',           //签名类型 支持HMAC-SHA256和MD5，默认为MD5
            'transaction_id' => $wxOrderNo,               //微信订单号
            'out_trade_no'   => $orderNo,        //商户订单号
            'out_refund_no'  => $refundNo,        //商户退款单号
            'refund_id'      => $refundId,     //微信退款单号
        );
        $unified['sign'] = self::getSign($unified, $config['key']);
        $responseXml     = $this->curlPost('https://api.mch.weixin.qq.com/pay/refundquery', self::arrayToXml($unified));
        file_put_contents('2.txt', $responseXml);
        $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
        if ($unifiedOrder === false) {
            die('parse xml error');
        }
        if ($unifiedOrder->return_code != 'SUCCESS') {
            die($unifiedOrder->return_msg);
        }
        if ($unifiedOrder->result_code != 'SUCCESS') {
            die($unifiedOrder->err_code);
        }

        return true;
    }

    public static function curlGet($url = '', $options = array())
    {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30);
        if ( ! empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);

        return $data;
    }

    public function curlPost($url = '', $postData = '', $options = array())
    {
        if (is_array($postData)) {
            $postData = http_build_query($postData);
        }
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
        if ( ! empty($options)) {
            curl_setopt_array($ch, $options);
        }
        //https请求 不验证证书和host
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        $data = curl_exec($ch);
        curl_close($ch);

        return $data;
    }

    public static function createNonceStr($length = 16)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $str   = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }

        return $str;
    }

    public static function arrayToXml($arr)
    {
        $xml = "<xml>";
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<".$key.">".$val."</".$key.">";
            } else {
                $xml .= "<".$key."><![CDATA[".$val."]]></".$key.">";
            }
        }
        $xml .= "</xml>";

        return $xml;
    }

    public static function getSign($params, $key)
    {
        ksort($params, SORT_STRING);
        $unSignParaString = self::formatQueryParaMap($params, false);
        $signStr          = strtoupper(md5($unSignParaString."&key=".$key));

        return $signStr;
    }

    protected static function formatQueryParaMap($paraMap, $urlEncode = false)
    {
        $buff = "";
        ksort($paraMap);
        foreach ($paraMap as $k => $v) {
            if (null != $v && "null" != $v) {
                if ($urlEncode) {
                    $v = urlencode($v);
                }
                $buff .= $k."=".$v."&";
            }
        }
        $reqPar = '';
        if (strlen($buff) > 0) {
            $reqPar = substr($buff, 0, strlen($buff) - 1);
        }

        return $reqPar;
    }
}